Fuel Leak Diagnosis

Fuel Leak Diagnosis

1. Remove the air cleaner assemble. Refer to Air Cleaner Assembly Replacement (Service and Repair) .
2. Clean all of the fuel lines between the fuel injection pump and the fuel injectors using brake cleaning solvent, and let dry.
3. Add 8 ounces of oil dye to the fuel tank. On dual tanks, add the dye to the front, or primary tank. Refer to Fuel System Description (Fuel System Description) .
4. Start and idle the engine for 3-5 minutes.
5. Command the fuel pressure control to 160 MPa (23,206 psi) with a scan tool.
6. Inspect for fuel leaks around the fuel injection pump, fuel rails, and fuel injector supply lines with aJ 28428-E High Intensity Black Light Kit.
Tighten or replace any leaking lines or components. Refer to the following:

* Fastener Tightening Specifications (Specifications)
* Fuel Injection Line Routing Diagram ([1][2]Fluid Diagrams)
* Fuel Injection Fuel Return Pipe Replacement - Left Side (Service and Repair)
* Fuel Injection Fuel Return Pipe Replacement - Right Side (Service and Repair)
* Fuel Feed Pipe Replacement (Service and Repair)
* Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (Fuel Injection Fuel Rail Assembly Replacement - Bank 1)
* Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (Fuel Injection Fuel Rail Assembly Replacement - Bank 2)
* Fuel Injection Pump Replacement (Service and Repair)
* Fuel Injector Replacement (Right) (Service and Repair)Fuel Injector Replacement (Left) (Service and Repair)

7. A fuel leak may be caused by restricted return fuel lines. Refer to Fuel Return System Diagnosis (Fuel Return System Diagnosis) .